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11-Ketotestosterone

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Matthew S Grober – 1st expert on this subject based on the ideXlab platform

  • Diurnal patterns and sex differences in cortisol, 11-Ketotestosterone, testosterone, and 17β-estradiol in the bluebanded goby (Lythrypnus dalli)
    General and Comparative Endocrinology, 2007
    Co-Authors: Varenka Lorenzi, Ryan L. Earley, Edmund W. Rodgers, D.r. Pepper, Matthew S Grober

    Abstract:

    Abstract The primary goals of this study were to evaluate diurnal patterns of and sex differences in the levels of cortisol, 11-Ketotestosterone, testosterone, and 17β-estradiol in the sex-changing bluebanded goby Lythrypnus dalli. Steroid hormones were collected from water samples and analyzed by enzyme immunoassay. During the breeding season, hormones were sampled from both males and females at seven time points between 0600 and 2000 h. When comparing each time point separately, there were significant overall time effects for cortisol and 17β-estradiol. Cortisol concentrations were lowest at the 0800–1000 h sampling point and showed a qualitative peak in late morning (1000–1200 h). Concentrations of 17β-estradiol were elevated at the last sampling point (1800–2000 h). Broader temporal trends were revealed for testosterone and 11-Ketotestosterone concentrations, both of which were elevated in the morning. There were no sex differences in overall hormone concentrations or temporal profiles for cortisol, 11-Ketotestosterone, or testosterone. Males and females showed similar diurnal patterns of 17β-estradiol but females had significantly higher water-borne 17β-estradiol levels than males. The results show the presence of diurnal changes in steroid hormone levels in male and female bluebanded gobies. The lack of sex differences in androgens suggests that males of this species, and perhaps other bi-directional sex-changing species in which males do not exhibit prominent secondary sexual characteristics, do not require persistent elevations in 11-Ketotestosterone or testosterone to maintain the male phenotype. Although the role of 17β-estradiol in maintaining sex differences in sexually plastic species is unclear, our results suggest that, of the hormones measured, 17β-estradiol has the greatest potential for future studies interested in this question.

  • Elevated 11-Ketotestosterone during paternal behavior in the Bluebanded goby (Lythrypnus dalli).
    Hormones and Behavior, 2006
    Co-Authors: Edmund W. Rodgers, Ryan L. Earley, Matthew S Grober

    Abstract:

    The relationship between androgens and paternal behavior is not straightforward, potentially because of the diversity of tasks a male must undertake to maximize reproductive success, notably alternating between courtship, aggression, and offspring care. In some species, these events are separated in time, but in others they are coincident. The endocrine profiles of species that simultaneously court, parent, and defend a nest, such as male bluebanded gobies (Lythrypnus dalli), are not well understood. We sampled a potent fish androgen, 11-Ketotestosterone (KT), at different life history stages (experienced parenting males, experienced males not actively parenting, inexperienced males with their first clutch, and females), to examine this relationship. We found that experienced parenting L. dalli males have the highest KT levels of any group, while none of the other groups differed significantly. Males showed elevated KT levels when they had eggs compared to when they did not. Our data suggest that KT facilitates at least some aspects of parental care in L. dalli.

  • 11 ketotestosterone inhibits the alternative mating tactic in sneaker males of the peacock blenny salaria pavo
    Brain Behavior and Evolution, 2001
    Co-Authors: Rui Filipe Oliveira, Luís Alberto Carneiro, David Goncalves, Adelino V M Canario, Matthew S Grober

    Abstract:

    In the peacock blenny, Salaria pavo , a species with courtship sex-role reversal, smaller, younger males mimic the courtship behavior and the nuptial coloration of females in order t

Eduardo N Barata – 2nd expert on this subject based on the ideXlab platform

  • 11 ketotestosterone stimulates putative sex pheromone production in the male peacock blenny salaria pavo risso 1810
    Biology of Reproduction, 2008
    Co-Authors: Adelino V M Canario, Rui M Serrano, Eduardo N Barata, Orlando Lopes, Peter C Hubbard, Jorge Araujo

    Abstract:

    Abstract Male peacock blennies (Salaria pavo) release odors from their anal glands and, possibly, from their gonads that attract reproductive females. The current study investigated the effects of 11-Ketotestosterone (KT) on development of the anal glands, testes, and accessory testicular organs as well as the subsequent olfactory potency of their secretions. After 3 wk of KT treatment (5 mg/kg in silastic implants), clusters of cells secreting neutral mucins differentiated in the anal gland of all treated males, whereas this occurred in only one control male. Secretions by anal glands from KT-treated males elicited greater olfactory responses, as assessed by electro-olfactography, than those from controls. Treatment with KT stimulated testicular gland growth and sialomucin secretion but had no clear effect on the germinal region of the testis; KT also stimulated enlargement of, and fluid secretion in, the blind pouches (paired evaginations of the spermatic ducts). Secretions by the testes and fluid in bl…

Adelino V M Canario – 3rd expert on this subject based on the ideXlab platform

  • Social context may affect urinary excretion of 11-Ketotestosterone in African cichlids
    Behaviour, 2020
    Co-Authors: Katharina Hirschenhauser, Adelino V M Canario, Michael Taborsky, Rui Filipe Oliveira

    Abstract:

    Summary We previously investigated the androgen responsiveness of males to simulated partner and territory intrusions in five African cichlid species (Neolamprologus pulcher, Lamprologus callipterus, Tropheus moorii, Pseudosimochromis curvifrons, Oreochromis mossambicus; Hirschenhauser et al., 2004). Here we re-analysed data on 11-Ketotestosterone (11-KT) levels in holding water to compare the free (presumably from the gills) and conjugated (presumably from urine and faeces) 11-KT fractions. We sampled (i) pre-test baseline control levels from individual males in social isolation and (ii) response levels released after social interactions, either with an ovulating female or a male territory intruder. In four out of five species, conjugated metabolites contributed to the observed total 11-KT responses in water during social context, which was particularly apparent in peak responsive individuals exposed to male intruders. Thus, in water from males sampled in isolation immunoreactive 11-KT seemed to derive both from gills and urine, whereas the urinary 11-KT component apparently increased in the social context, particularly when a male was challenged by a same-sex intruder. These results suggest that (i) the social context may affect urine release patterns of males and (ii) 11KT data acquired by using fish-holding water may not simply reflect the passive transmission of steroid hormones via the gills.

  • 11 ketotestosterone stimulates putative sex pheromone production in the male peacock blenny salaria pavo risso 1810
    Biology of Reproduction, 2008
    Co-Authors: Adelino V M Canario, Rui M Serrano, Eduardo N Barata, Orlando Lopes, Peter C Hubbard, Jorge Araujo

    Abstract:

    Abstract Male peacock blennies (Salaria pavo) release odors from their anal glands and, possibly, from their gonads that attract reproductive females. The current study investigated the effects of 11-Ketotestosterone (KT) on development of the anal glands, testes, and accessory testicular organs as well as the subsequent olfactory potency of their secretions. After 3 wk of KT treatment (5 mg/kg in silastic implants), clusters of cells secreting neutral mucins differentiated in the anal gland of all treated males, whereas this occurred in only one control male. Secretions by anal glands from KT-treated males elicited greater olfactory responses, as assessed by electro-olfactography, than those from controls. Treatment with KT stimulated testicular gland growth and sialomucin secretion but had no clear effect on the germinal region of the testis; KT also stimulated enlargement of, and fluid secretion in, the blind pouches (paired evaginations of the spermatic ducts). Secretions by the testes and fluid in bl…

  • 11 ketotestosterone inhibits the alternative mating tactic in sneaker males of the peacock blenny salaria pavo
    Brain Behavior and Evolution, 2001
    Co-Authors: Rui Filipe Oliveira, Luís Alberto Carneiro, David Goncalves, Adelino V M Canario, Matthew S Grober

    Abstract:

    In the peacock blenny, Salaria pavo , a species with courtship sex-role reversal, smaller, younger males mimic the courtship behavior and the nuptial coloration of females in order t